Filter leaf



FILTER LEAF Filed March 26, 1945 2 Sheets-Sheet l FIG. 2.

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Z I6 20 IO 10 35 35 i INVENTC R EowAno A. ULRICH v 1 a ATTORNEYS I E. A. ULRICH June 8, 1948.

FILTER LEAF.

2 Sheets-Sheet 2 Filed March 26, 1945 FIG. 5.

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Patented June 8, 1948 oN-rrsu sr-Ares PATENT oFFicE FIETER LEAF Edward A. Ulrich; K- enmore, N. Y., assignor to Arnolddacohowitz, Buffalo, N. Y.

AppIica-tiomMarch 26, 1945, Serial No: 584,776

Glaims. 1. This invention: relates" to industriali filter: and screening devices, and more. particularly to.- imp provements in leaf filter O'IISQIBEII devices such.

asare used-in. processing liquid? comestiblesisuch as milk or beer or vegetable oils-- or: other materials such as are susceptible: of: deterioration or such as are otherwise of such-characteristics'as tocause it to be undesirable to permit. deposits from. the filtered substance toaccumulate over.

substantial periods of time within the filtering orscreening. devices.

One of. the. objectsoi the-invention-isto provide an improved filter leaf unit. of the character referred to here-inabove. Another object. of the invention is to provide an improved filter leaf unit which is adapted. to. bereadily disassembled and reassembled to facilitate effective cleaning:

and/or sterilizing of. the interior partsthereoi.

Another object ofthe invention is to. prov de an.

improved filter leaf unit of the character dc scribed which is structurally simple and rugged.

and inexpensive to provide. Another obiect'of the invention is to provide a filter unit of the character described which is readily separable for interior cleaning purposes without requiring the use of detachable connection devicessuchas bolts and screws and gaskets in order topr'ovide fluid tight assembly thereof.

Another object. oi the invention is to provide an improved filter leaf unit; of the character described which is adapted to avoidundulyrapid accumulationstherein of solids-from the filtered substance. Another objector the inventionis toprovide a filter leaf: unit embodying the features outlined hereinabove and which is adapted to be 4 is a fragmentary section, onv an enlarged-l scale, taken along line IVIV'oi Fig; 1;

Fig. 5 is a fragmentaryillustration, on an enlarged scale, of the filter nozzleportion of Fig,- l, with parts broken away to show the interiorthereof Fig. 6 is a fragmentary perspective illustrating another form of filter screen and spacer arrange-.- ment; and

Fig. 7 is a view similar to Fig. 3 showing another- (Cl. 210l9.5)

2;. form offilterscreen marginal binding and clamping arrangement.

The invention isillustrated in Figs. 1-5 to comprise a=filter learunit consisting of opposed spaced meshed wire screens ill-.48 whicharesoldered or welded or otherwise-firmly attached in fluid tight relation to cor-responding marginal framing As:ill'ustrated in Fig. 3, the framingmembersl2..-l2" are recessed at l4 so as to be adapted to be assemblediin backeto-back' relation at their abutting: faces lfi while therebydisposing. the-screen cloth portions I fly-48 in parmembers 12-42.

allel spacedrelation; Ascreen' cloth spacing devicesuch as a: coarse Woven screen; member I5 may be disposedhetween the screencloth sections Iii-4t so as. to maintain the, latterin-relativ ly spaced relation: throughout the central regions thereof even though substantialfluid-pressures maybe applied-againstthe screen cloth elements from exteriorlythereof. Or, asshew n in Fig. 6,

the spacer devicemay' comprise a, metal'plate 0rthe lilreas'ihdicatecl-at #8, which has been dimpled as indicated at 13. or otl ierwise distorted-so as'to be irregularlysurf-aeed toprovide open fluid passageways between the screen cloth elementsand opposite faces of the spacer device.

Referring again to PigS, 1- 5, the. framing elements' l2..l2 are exterio-rly rounded and-grooved as-indicated at ZO-sdas to beadaptedtoreceive therein opposite edges-of channeleshaped' clamp-v ingdevices: 22 which are preferably formed. ofspring steel or other suitable material so as to beadapted to be either snap-fittedior slipped en dwise over the roundedouter surfaces oi'the framing elements-for firmly clamping thelatter together in pressured back-.to-bach relation; thusbringing.

the opposite screen cloth element lli lll into relatively assembledparallel' relation with the. spacer-device therebetween. This arrangement providessealing pressures continuously around the screen frame perimeter, as distinguished from spaced localizedlpressures such would be provided-by bolts orthe like. I Therefore, in the filter leaf oithe invention-optimum sealing effects are procured without the use of accessory gasket elevices and the like, Preferably. complementing pin and socket devicesas indicated at Mwill be provided in opposite registering portions oiZthe framing. elements for relatively positioning the filter screen elements properly prior to mounting,

of the. clamping elements 22 thereon. The filtrate outlet nozzle of'the filter. leaf unit is provided by welding. split collar portions 38-38 to suitable cutwaway bottom portions of; the framingmem hers. I 2=-=l2, as by means of. weldingillustrated.

at 32. A flanged nozzle 34 may then be simply bolted to the filter leaf unit as by means of bolts 35-35 (Fig. 4).

Fig. 7 illustrates a modified form of the framing elements of the filtering screen cloth devices. In this case the framing elements are designated at 26-26 to possess external configuration identical to the devices l2-I2 of Figs. 1-5; but in the case of Fig. '7 the framing elements are interiorly hollowed as at 28 to provide, when relatively assembled, an open channel extending perimetrically of the filter leaf unit and in open communication throughout the entire perimeterthereof with the space between the filtering screen cloth devices I0l0.

Thus, it will be understood that the perimetral fluid chamber provided by the channeled portions 28 in the framing elements will permit free flow of filtrate therethrough into the outlet nozzle 34; and that subsequent to passing through the filter screen cloths |lll 0 the filtrate will fiow through the space between the screen cloths in the radial directions representing the shortest paths into the perimetral fluid channels interiorly of the framing elements, for conveyance through the latter toward the outlet nozzle 34. In this manner, a system of fluid circulation is established interiorly of the filter leaf unit which involves initial filtrate flow through the space between the screen elements in directions radially and outwardly to positions beyond the marginal edges of the screen elements and their unobstructed flow through the frame open channels, whereby there will be no fluid flow directional changes interiorly of the edge portions of the screen cloth elements such as would otherwise tend to cause deposit of solids accumulations in those portions of the filtrate leaf unit. Therefore, it will be understood that a particular feature and advantage of the invention, in addition to the ability of the filter leaf unit to be readily disassembled for internal scrubbing and cleansing thereof, is that due to the mode of construction of the filter leaf unit there is less tendency for the latter to accumulate solids deposits interiorly thereof, compared to similar devices of the prior art.

In order to disassemble the filtrate leaf unit of the invention for interior cleansing purposes it is only necessary to slide the clamping elements 22 out of clamping position relative to the framing members of the filter unit, and to unbolt the nozzle 3'1 therefrom, whereupon the two sections of the filter leaf unit are free to be separated and may be both interiorly and exteriorly scrubbed or otherwise cleaned, as may be required. Upon completion of the cleansing operations the filter unit sections may then be simply brought together again in back-to-baok relation and locked in superior leak-proof manner by snapping or sliding the clamping strips 22 into assembled positions thereon.

It will be appreciated that although only a few forms of the invention have been illustrated and described in detail, the invention is not so limited and that various changes may be made therein without departing from the spirit of the invention and the scope of the appended claims.

I claim:

1. A filter leaf unit comprising two oppositely disposed frame elements, each having a rounded outer peripheral edge extending along substantially the entire length of the periphery, each of said elements being formed with a complemental recess in its adjacent face and a surface designed to engage the coacting surface of the adjacent element in mutual fluid-sealing contact, a filter screen for each element permanently secured in the recess thereof, C-shaped clamping means of resilient material shaped to engage the rounded periphery of the assembled elements, an outlet member comprising a two-piece split collar portion, each portion being secured to one of said elements, and an outlet nozzle portion removably secured to the assembled collar portions.

2. A filter leaf unit comprising two oppositely disposed frame elements, each having a rounded outer peripheral edge extending along substantially the entire length of the periphery and formed with a clamp-receiving groove located back of the peripheral edge, each of said elements being formed with a complemental recess in its adjacent face and a surface designed to engage the coacting surface of the adjacent element in mutual fluid-sealing contact, a filter screen for each element permanently secured in the recess thereof, C-shaped clamping means of resilient material shaped to conform to and engaged with the rounded periphery of the assembled elements, said means having parallel edges for engagement with the grooves of said elements, an outlet member comprising a two-piece split collar portion, each portion being secured to one of said elements, and a flanged outlet nozzle portion removably secured to the assembled collar portions.

3. A filter leaf unit comprising two oppositely disposed frame elements, each having a rounded outer peripheral edge extending along substantially the entire length of the periphery, each of said elements being formed with a complemental recess in its adjacent face and a surface designed to engage the coacting surface of the adjacent element in mutual fluid-sealing contact, a filter screen for each element permanently secured in the recess thereof, a backing plate disposed between said screens when assembled and having a plurality of oppositely extending protuberances for keeping said screens in spaced relation, 0- shaped clamping means of resilient material shaped to engage the rounded periphery of the assembled elements, an outlet member comprising a two-piece split collar portion, each portion being secured to one of said elements, and a flanged outlet nozzle portion removably secured to the assembled collar portions.

4. A filter leaf unit comprising two oppositely disposed frame elements, each having a rounded outer peripheral edge extending along substantially the entire length of the periphery and formed with a clamp-receiving groove located back of the peripheral edge, each of said elements being formed with a complemental recess in its adjacent face and a surface designed to engage the coacting surface of the adjacent element in mutual fluid-sealing contact, a filter screen for each element permanently secured in the recess thereof, a backing plate disposed between said screens when assembled and having a plurality of oppositely extending protuberances for keeping said screens in spaced relation, C-shaped clamping means of resilient material shaped to engage the rounded periphery of the assembled elements, said means having parallel edges for engagement with the grooves of said elements, an outlet member comprising a two-piece split collar portion, each portion being secured to one of said elements, and a flanged outlet nozzle portion removably secured to the assembled collar portions.

5. A filter leaf unit comprising two oppositely disposed frame elements, each having a rounded outer peripheral edge extending along substan tially the entire length of the periphery and formed with a clamp-receiving groove located back of the peripheral edge, each of said ele-- ments being formed with a complemental recess in its adjacent face and a surface designed to engage the coacting surface of the adjacent element in mutual fluid-sealing contact, a filter screen for each element permanently secured in the recess thereof, a backing plate disposed between said screens when assembled and having a plurality of oppositely extending protuberances for keeping said screens in spaced relation, means carried by said elements for retaining the same in alignment, C-shaped clamping means of resilient material shaped to engage the rounded periphery of the assembled elements, said means having parallel edges for engagement with the grooves of said elements, an outlet member comprising a two-piece split collar portion, each portion being secured to one of said elements, and a flanged outlet nozzle portion removably secured to the assembled collar portions.

EDWARD A. ULRICH.

REFERENCES CITED The following references are of record in the file of this patent:

1st addition of 312,867 

